Cannabis

Also known as marijuana, pot, weed, grass, reefer, etc. A plant that people have used for thousands of years for a variety of purposes, including textiles, fuel, paper, protein etc. Used medicinally for centuries, but prohibited in the U.S. and many countries around the world because, um… people enjoy the psychoactive effects of ingesting it, by smoking, eating or inhaling vapor. For a comprehensive cultural history see Smoke Signals by Martin Lee.